Meaning of “no one” - Learner’s Dictionary

no one

pronoun us uk
Extra Examples
She had no one to guide her as a teenager.Thankfully no one was harmed in the accident.Luckily, no one was inside the house when the fire started.If the sign's too small, no one will notice it.Stop being so paranoid - no one's talking about you.

A2 no person:

No one bothered to read the report.
No one knows where he is now.
There was no one there.
No one else makes cakes like my mother.

(Definition of “no one” from the Cambridge Learner’s Dictionary © Cambridge University Press)